Problems with hacked iPhone 2G upgrade to 3.0

"Could not activate cellular data network: You are not subscribed to a cellular data service"
Fix: Put in the correct APN settings at Setting / General / Network / Cellular Data Network /
On UK Orange, it's
APN: orangeinternet
Username : orange
Password : multimedia

Super fast Battery drain & overheat

There's a dodgy setting with PUSH notification keeping the phone awake & looking.
Delete email accounts on iPhone. Then manually type them in again.

YouTube doesn't work.
DevTeam is aware of this and working on a fix.

Find my iPhone doesn't work.